Portable navigation device



FIG. 1 is a front perspective view of the portable navigation device.

FIG. 2 is a rear perspective view of the portable navigation device.

FIG. 3 is a front view of the portable navigation device.

FIG. 4 is a rear view of the portable navigation device.

FIG. 5 is a left side view of the portable navigation device; and,

FIG. 6 is a right side view of the portable navigation device. 

CLAIM The ornamental design for a portable navigation device, as shown and described. 